CODEWITHSUNDEEP
c#oop
Andres Traumann
Andres Traumann

Reputation: 154

Derived member object in a derived class

I have the following classes:

public class A {
    public C mObj:
}

public class B : A {
}

public class C {
    public int val1;
}

public class D : C {
    public int val2;
}

I initialize all the class B instances in a way that inst.mObj = new D();. When I have an instance of class B I would ideally like to access all the members of class D by using mObj, but due to inheritance I can not do it without casting into D first.

I would like class B to have a member object of class D, but I automatically inherit a member from class C. Is there a way to achieve something like that? If not then how is it usually done when a similar structure is required?

Upvotes: 0

Views: 54

Answers (1)

Eugene Podskal
Eugene Podskal

Reputation: 10401

It is difficult to determine your exact requirements, but you could try to use generics with type constraints:

public class A<T>
    where T : C
{
    public T mObj:
}

public class B : A<D> 
{
}

public class C 
{
    public int val1;
}

public class D : C 
{
    public int val2;
}

In this case the mObj in B will be of type D, so no conversion will be required.

Upvotes: 4

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